Chevrolet Silverado Classic 2007 Owner's Manual page 584

4. Repeat this procedure at least two times. If
the spare tire lowers to the ground, continue
with Step 5 of Removing the Spare Tire
and Tools on page 570.
5. Turn the wrench counterclockwise until
approximately 6 inches (15 cm) of cable
is exposed.
6. Stand the wheel blocks on their shortest ends,
with the backs facing each other.
584
7. Place the bottom
edge of the jack (A)
on the wheel
blocks (B),
separating them so
that the jack is
balanced securely.
8. Attach the jack handle, extension, and wheel
wrench to the jack and place it (with the
wheel blocks) under the vehicle towards the
front of the rear bumper.